/**
 * @author ASUS
 */
public class Exercise1 {
    public static void main(String[] args) {
        double PI = 3.14;
        double r1 = 1.5;
        double r2 = 2.5;
        int r3 = 3;
        System.out.println("圆的面积1：" + PI * r1 * r1);
        System.out.println("圆的面积2：" + PI * r2 * r2);
        System.out.println("圆的面积3：" + PI * r3 * r3);


    }
}
